I know that your list 'who does what' of royal patronage was not intended to be exhaustive ('Roll out the red carpet', 8 April), but I should point out that Princess Alexandra has been associated with our hospital since its opening in 1965 and agreed last year to continue as our patron.

We were delighted that she was able to visit us last year as part of the 50th anniversary of the NHS.

Martin Lawn

Chair

The Princess Alexandra Hospital trust

Harlow

Essex